Marbling books

This Persian or Turkish ebru, 19th century books, It is also known as marbling.
One of the ideas I am going to use for paper making is to use marbling in books just as how books used to feature in the 19th Century.
I really like them, as it adds a bit of colour to the book often when they are very simple. 
I did try this and I think it has worked .
This style has gone out of fashion.
I am going to try this in my own work when I make my paper books.

Book Binding was quite easy depending upon which one I created. The zig zag binding was harder to create however. When creating the final one it will have to be very neat.

Here are some more examples.
I also found some examples where paintings were used instead.